The influence of ultraviolet rays on the corrosion behavior of 7075 aluminum alloy in the marine atmosphere was studied by salt spray corrosion test. Electrochemical methods and surface analysis techniques were used to analyze and compare the corrosion laws of 7075 aluminum alloy in the marine atmosphere under ultraviolet radiation with wavelengths of 0 nm, 185 nm, 254 nm, and 365 nm. The results showed that ultraviolet light irradiation could promote the corrosion of 7075 aluminum alloy. Oxygen was prone to chemical reactions to form oxygen atoms after being irradiated by ultraviolet rays, and oxygen atoms recombined with oxygen to form ozone in the marine atmosphere. The 7075 aluminum alloy in the marine atmosphere accelerated corrosion due to the increasing ozone content. Although there were passivation films with different degrees of protection on the surface of aluminum alloy under ultraviolet irradiation, the surface of 7075 aluminum alloy in the marine atmosphere failed to form a stable passivation film after pitting, and the corrosion rate was the fastest when the ultraviolet wavelength was 185 nm.

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紫外线波长对海洋大气环境中7075铝合金腐蚀行为的影响

通过盐雾腐蚀试验研究了紫外线对7075铝合金在海洋大气中腐蚀行为的影响。用电化学方法和表面分析技术对7075铝合金在0nm，185nm，254nm和365nm波长的紫外线辐射下在海洋大气中的腐蚀规律进行分析和比较。结果表明，紫外线辐射可促进7075铝合金的腐蚀。氧气在受到紫外线照射后易于发生化学反应，形成氧原子，并且氧原子与氧重新结合，在海洋大气中形成臭氧。由于臭氧含量的增加，海洋大气中的7075铝合金加速了腐蚀。